A MUSIC fan has been left with a huge bill after his voice-operated Amazon Echo device threw a house party while he was away.

Cops were forced to break into Oliver Haberstroh's flat in Hamburg, Germany, after neighbours complained about deafening music blasting from inside - but found the apartment empty.

The smart speaker system allegedly blasted music at 2am while Mr Haberstroh was drinking with friends

Mr Haberstroh claims he walked out of his flat to meet friend on Friday night after checking that the lights and music were switched off.

He wrote on Facebook: "While I was relaxed and enjoying a beer, Alexa managed on her own, without command and without me using my mobile phone, to switch on at full volume and have her own party in my apartment"

"She decided to have it at a very inconvenient time, between 1.50am and 3am. My neighbours called the police."

After knocking on the door, the officers called an expert to break the lock open - and refused to hand over keys for the replacement until they'd been paid for the locksmith.